Facing the same dilemma (and wanting to mount a receiver hitch at the rear of the trailer!), local Keystone dealer was able to order a mount (from Keystone) to hold my tire up under the trailer. As I recall, could have mounted in front or behind axles. I opted for up front, behind the landing gear to somewhat balance the weight I was adding with the receiver hitch. Spare tire mount was $305 installed, money well spent.
I haven't mastered attaching photos, if you'd like, you are welcome to PM me and send an e-mail address, I'm happy to shoot you pictures by that route.
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2013 Silverado 3500HD - Duramax/Allison - CC, long bed, SRW, 2WD
2013 Springdale 247FWRLLS - 1st 5er sold - 1 July 2016
2017 Grand Design Reflection 303RLS
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